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1 files changed, 232 insertions, 0 deletions

diff --git a/src/main/kotlin/Main.kt b/src/main/kotlin/Main.kt
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+++ b/src/main/kotlin/Main.kt
@@ -0,0 +1,232 @@
+package org.example
+
+import com.google.gson.GsonBuilder
+import com.google.gson.JsonArray
+
+import java.net.URL
+import java.util.regex.Matcher
+import java.util.regex.Pattern
+import kotlin.system.exitProcess
+
+val allowedCategories = listOf("New Features", "Improvements", "Fixes", "Technical Details", "Removed Features")
+
+val categoryPattern = "## Changelog (?<category>.*)".toPattern()
+val changePattern = "\\+ (?<text>.*) - (?<author>.*)".toPattern()
+val extraInfoPattern = " {2}\\* (?<text>.*)".toPattern()
+val illegalStartPattern = "^[-=*+ ].*".toPattern()
+
+fun getTextFromUrl(urlString: String): List<String> {
+    val url = URL(urlString)
+    val connection = url.openConnection()
+    val inputStream = connection.getInputStream()
+    val text = mutableListOf<String>()
+
+    inputStream.bufferedReader().useLines { lines ->
+        lines.forEach {
+            text.add(it)
+        }
+    }
+
+    return text
+}
+
+fun main() {
+    val firstPr = 1071
+    val hideWhenError = true
+
+    println(" ")
+    val url =
+        "https://api.github.com/repos/hannibal002/SkyHanni/pulls?state=closed&sort=updated&direction=desc&per_page=50"
+    val data = getTextFromUrl(url).joinToString("")
+    val gson = GsonBuilder().create()
+    val fromJson = gson.fromJson(data, JsonArray::class.java)
+    val prs = fromJson.map { gson.fromJson(it, PullRequest::class.java) }
+    readPrs(prs, firstPr, hideWhenError)
+}
+
+fun readPrs(prs: List<PullRequest>, firstPr: Int, hideWhenError: Boolean) {
+    val categories = mutableListOf<Category>()
+    val allChanges = mutableListOf<Change>()
+    findAllChanges(prs, allChanges, categories, firstPr, hideWhenError)
+
+    for (type in OutputType.entries) {
+        print(categories, allChanges, type)
+    }
+}
+
+enum class OutputType {
+    DISCORD_INTERNAL,
+    GITHUB,
+    DISCORD_PUBLIC,
+}
+
+private fun print(
+    categories: MutableList<Category>,
+    allChanges: MutableList<Change>,
+    outputType: OutputType,
+) {
+    val extraInfoPrefix = when (outputType) {
+        OutputType.DISCORD_PUBLIC -> " = "
+        OutputType.GITHUB -> "   * "
+        OutputType.DISCORD_INTERNAL -> "       "
+    }
+    println(" ")
+    println(" ")
+    println("outputType: $outputType")
+    println(" ")
+    for (category in allowedCategories.map { getCategory(categories, it) }) {
+        if (outputType == OutputType.DISCORD_PUBLIC && category.name == "Technical Details") continue
+        val changes = allChanges.filter { it.category == category }
+        if (changes.isEmpty()) continue
+        println("### " + category.name)
+        if (outputType == OutputType.DISCORD_PUBLIC) {
+            println("```diff")
+        }
+        for (change in changes) {
+            val pr = when (outputType) {
+                OutputType.DISCORD_PUBLIC -> ""
+                OutputType.GITHUB -> " (${change.prLink})"
+                OutputType.DISCORD_INTERNAL -> " [PR](<${change.prLink}>)"
+            }
+            val changePrefix = getChangePrefix(category.name, outputType)
+            println("$changePrefix${change.text} - ${change.author}$pr")
+            for (s in change.extraInfo) {
+                println("$extraInfoPrefix$s")
+            }
+        }
+        if (outputType == OutputType.DISCORD_PUBLIC) {
+            println("```")
+        }
+    }
+}
+
+fun getChangePrefix(name: String, outputType: OutputType): String {
+    return when (outputType) {
+        OutputType.DISCORD_INTERNAL -> "    "
+        OutputType.GITHUB -> " + "
+        OutputType.DISCORD_PUBLIC -> when (name) {
+            "New Features" -> "+ "
+            "Improvements" -> "+ "
+            "Fixes" -> "~ "
+            "Removed Features" -> "- "
+            else -> error("impossible change prefix")
+        }
+    }
+}
+
+private fun findAllChanges(
+    prs: List<PullRequest>,
+    changes: MutableList<Change>,
+    categories: MutableList<Category>,
+    firstPr: Int,
+    hideWhenError: Boolean,
+) {
+    var errors = 0
+    var done = 0
+    for (pr in prs) {
+        val number = pr.number
+        val prLink = pr.htmlUrl
+        val body = pr.body
+        val merged = pr.mergedAt != null
+        if (!merged) continue
+
+        val description = body?.split(System.lineSeparator()) ?: emptyList()
+        try {
+            changes.addAll(parseChanges(description, prLink, categories))
+            done++
+        } catch (t: Throwable) {
+            println("")
+            println("Error in #$number ($prLink)")
+            println(t.message)
+            errors++
+        }
+        if (number == firstPr) break
+    }
+    println("")
+    println("found $errors errors")
+    if (errors > 0) {
+        if (hideWhenError) {
+            exitProcess(-1)
+        }
+    }
+    println("Loaded $done PRs")
+}
+
+inline fun <T> Pattern.matchMatcher(text: String, consumer: Matcher.() -> T) =
+    matcher(text).let { if (it.matches()) consumer(it) else null }
+
+@Suppress("IMPLICIT_NOTHING_TYPE_ARGUMENT_IN_RETURN_POSITION")
+fun parseChanges(
+    description: List<String>,
+    prLink: String,
+    categories: MutableList<Category>,
+): List<Change> {
+    var currentCategory: Category? = null
+    var currentChange: Change? = null
+    val changes = mutableListOf<Change>()
+    for (line in description) {
+        if (line == "") {
+            currentChange = null
+            currentCategory = null
+            continue
+        }
+
+        categoryPattern.matchMatcher(line) {
+            val categoryName = group("category")
+            if (categoryName !in allowedCategories) {
+                error("unknown category: '$categoryName'")
+            }
+            currentCategory = getCategory(categories, categoryName)
+            currentChange = null
+            continue
+        }
+
+        val category = currentCategory ?: continue
+
+        changePattern.matchMatcher(line) {
+            val author = group("author")
+            val text = group("text")
+            if (illegalStartPattern.matcher(text).matches()) {
+                error("illegal start at change: '$text'")
+            }
+            currentChange = Change(text, category, prLink, author).also {
+                changes.add(it)
+            }
+            continue
+        }
+
+        extraInfoPattern.matchMatcher(line) {
+            val change = currentChange ?: error("Found extra info without change: '$line'")
+            val text = group("text")
+            if (illegalStartPattern.matcher(text).matches()) {
+                error("illegal start at extra info: '$text'")
+            }
+            change.extraInfo.add(text)
+            continue
+        }
+        error("found unexpected line: '$line'")
+    }
+
+    if (changes.isEmpty()) {
+        error("no changes found")
+    }
+
+    return changes
+}
+
+fun getCategory(categories: MutableList<Category>, newName: String): Category {
+    for (category in categories) {
+        if (category.name == newName) {
+            return category
+        }
+    }
+    val category = Category(newName)
+    categories.add(category)
+    return category
+}
+
+class Category(val name: String)
+
+class Change(val text: String, val category: Category, val prLink: String, val author: String) {
+    val extraInfo = mutableListOf<String>()
+}